The light pool raining down from the top of the subject on the stage isolates him and creates a more intimate feel by eliminating the rest of the stage space from view.
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The angle of light creates interesting shadows on the facial features of the subject. Coupled with make-up this could be a powerful effect.
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The angle of light in this picture is coming from the right at a low level. It creates a feeling of sunrise or sunset.
The angle of the light shooting through the window tells us the source, mostly likely the sun, is in a straight line from that angle.
This shaft of light would be created by the sun being directly over the opening in the cavern. It is interesting how luminated the rest of the cavern is by this single light source.
